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单击此处编辑母版标题样式,单击此处编辑母版文本样式,第二级,第三级,第四级,第五级,*,Unit 2,cloning,Warming up,1.How much do you know about clone?What is clone?,It is a way of making an exact copy of another animal and plant.,1.Do you want to be cloned or not?Why?,克隆,”,一词源于,“,Clone,”,的音译，指的是人工诱导动、植物的无性繁殖过程，这门生物技术就叫克隆技术。无性繁殖是指不经过雌雄两性生殖细胞的结合，只由一个生物体产生后代的生殖方式，如：由植物的根、茎、叶等经过压条或嫁接等方式产生新个体。绵羊、猴子和牛等动物没有人工操作是不能进行无性繁殖的。,2.Do you want to be cloned or not Why,?,3.,In pairs,look at these pictures and discuss which ones are natural clones and which ones are man-made.Explain how they differ.,the twins are natural clones,The twins were born at the same time,Dolly,是世界上第一例用体细胞,乳腺上皮细胞,通过细胞核移植技术,在复杂的人工操作下,得到的一只小绵羊,。,一株草莓依靠它沿地,“,爬走,”,的匍匐茎,一年内就能长出数百株草莓苗,富贵竹插枝即活,仙人掌每块落地就生根,
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